Everything for this is in place. No changes or features outside of AP are needed. Mastodon even has a simple key-value table that any profile can enable and fi

Everything for this is in place. No changes or features outside of AP are needed. Mastodon even has a simple key-value table that any profile can enable and fill with details such as "website: example.com", "twitter: @jack" and so on. This feature already has "verifications". Meaning that you can add proof that example.com, keybase etc are really yours. This could easily[1] be expanded to verify ownership of SMS, or messenger apps. Provided those apps have some form or authentication/proof in place. I have this on our roadmap for our "fediverse linkedin" project (another story for another time) so would gladly offer help here; keybase with my contact details in my hn profile. -- [1] It would be easy after a refactoring. The code handling this in Mastodon is not ugly persé, but rather unfortunate. Tightly coupled to the God-Model "User" (which seems to happen with every rails project at some point) and spread over some json-store, model and unrelated controllers.